/Engine/Plugins/AI/MassAI/Source/MassNavigation/Public/MassNavigationSubsystem.h
typedef [THierarchicalHashGrid2D](API\Runtime\AIModule\THierarchicalHashGrid2D)< 2, 4, [FMassNavigationObstacleItem](API\Plugins\MassNavigation\FMassNavigationObstacleItem) > FNavigationObstacleHashGrid2D